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| Remove 0.7 bar oil pressure switch -F1- -brown insulation- and screw into tester. |
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| Screw tester into oil filter bracket in place of oil pressure switch. |
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| Connect brown wire of tester to earth (-). |
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| Connect voltage tester -V.A.G 1527 B- to battery positive (+) and oil pressure switch using cables from auxiliary measuring set -V.A.G 1594/A-. LED must not light up. |
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| Start engine and increase speed slowly. At 0.55...0.85 bar the LED must light up; otherwise renew oil pressure switch. |
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| Increase engine speed further. At 2000 rpm and an oil temperature of 80 °C the oil pressure should be at least 2.0 bar. |
| At higher engine speed, oil pressure must not exceed 7.0 bar. If necessary renew oil filter bracket. |
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